Let's dive into this subtraction. We'll start with 504036184 and subtract 490944144 from it.

Step 1: We'll start by subtracting the digit 4 and the borrow 0 from 4 in column 1 and get 0.
0 is the first digit of our result.

Step 2: We'll start by subtracting the digit 4 and the borrow 0 from 8 in column 2 and get 4.
4 is the next digit of our result.

Step 3: We'll start by subtracting the digit 1 and the borrow 0 from 1 in column 3 and get 0.
0 is the next digit of our result.

Step 4: We'll start by subtracting the digit 4 and the borrow 0 from 6 in column 4 and get 2.
2 is the next digit of our result.

Step 5: We'll start by subtracting the digit 4 and the borrow 0 from 3 in column 5 and get -1.
We add -1 to 10 and get 9 as the next digit of the result.

Step 6: We'll start by subtracting the digit 9 and the borrow 1 from 0 in column 6 and get -10.
We add -10 to 10 and get 0 as the next digit of the result.

Step 7: We'll start by subtracting the digit 0 and the borrow 1 from 4 in column 7 and get 3.
3 is the next digit of our result.

Step 8: We'll start by subtracting the digit 9 and the borrow 0 from 0 in column 8 and get -9.
We add -9 to 10 and get 1 as the next digit of the result.

Step 9: We'll start by subtracting the digit 4 and the borrow 1 from 5 in column 9 and get 0.
0 is the next digit of our result.

So, 504036184 - 490944144 = 13092040.